Significantly enhanced dielectric permittivity and low loss in epoxy composites incorporating 3d W-WO 3 /BaTiO 3 foams
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Significantly enhanced dielectric permittivity and low loss in epoxy composites incorporating 3d W-WO3/ BaTiO3 foams Wenqiang Zhang1, Xiaotong Zhu1, Liang Liang1, Peng Yin1, Peitao Xie2,*, Davoud Dastan3, Kai Sun4, Runhua Fan4, and Zhicheng Shi1,* 1
School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, People’s Republic of China State Key Laboratory of Bio-Fibers and Eco-Textiles, Institute of Biochemical Engineering, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, People’s Republic of China 3 School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta Georgia-30332, USA 4 Institute of Marine Materials Science and Engineering, Shanghai Maritime University, Shanghai 201306, People’s Republic of China 2
Received: 7 June 2020
ABSTRACT
Accepted: 3 November 2020
With the rapid development of miniaturization and high integration of electronic devices, increasing attention has been paid to the exploration of dielectric composites with further improved dielectric permittivities. Herein, a unique design of high dielectric permittivity composites consisting of three-dimensional porous W-WO3/BaTiO3 foams hosted in epoxy matrix is proposed. It is demonstrated that the introduction of W-WO3/BaTiO3 foams into the epoxy matrix results in substantially improved dielectric permittivities in comparison with the epoxy matrix. Meanwhile, low loss which is comparable to that of the epoxy matrix is well maintained. Interestingly, obviously enhanced dielectric permittivities and greatly depressed loss are concurrently achieved via increasing the oxidation temperature. In particular, the composite with 53.1 wt% W-WO3/BaTiO3 foam oxidized at 1300 °C exhibits a high dielectric permittivity of * 536 and a low loss tangent of * 0.05@10 kHz which are about 149 and 1.5 times those of the epoxy matrix, respectively. It is believed that the strong interfacial polarization and the numerous equivalent micro-capacitors result in the significantly improved dielectric permittivities. The finite element simulation results reveal that the formation of the WO3 shell on the surface of W can effectively weaken the leakage current density, yielding the sharply depressed loss. This work provides a new strategy to design polymer composites with simultaneous high dielectric permittivity and low loss, and the strategy could
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Dale Huber.
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https://doi.org/10.1007/s10853-020-05536-z
J Mater Sci
also be applicable to the exploration of other high-performance dielectric composites.
Introduction As polymer dielectric composites have the advantages of high breakdown strength, large-scale processability, excellent mechanical flexibility, lightweight and low lost [1], ever-increasing attention has been devoted to their application in filter [2], sensors [3], capacitors [4, 5], field-effect transistors (FE
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